Clamping device.



Patented Nov. 27, wow;

J. H. DUWNIE. CLAMPING DEVICE.

(Application filed June 4, 1900.)

(No Model.)

1.7V VENTOR.

A WI

m: nonma PETERS co. PNOTG-LHHD, WASHINGTON, r; c.

Unirtno ramps Parnnr tili ntmn.

JAMES H. DOVNIE, OF DETROIT, MICHIGAN.

CLAIVI PING DEVICE.

SPECIFICATION forming part of Letters Patent No. 662,638, dated November27, 1900.

Application filed June 4, 1900. serial No. 18,984. (No model.)

T0 whom it may concern:

Be it known that I, JAMES H. DOWNIE, a citizen of the United States,residing at Detroit, county of Wayne, State of Michigan, have invented acertain new and useful Improvement in Clamping Devices; and I declarethe following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappertains to make and use the same, reference being bad to theaccompanying drawings, which form a part of this specification.

My invention has for its object a reciprocatory clamping device forholding work to a grinding-wheel; and it consists of the con struction,combination, and arrangement of devices hereinafter described andclaimed, and illustrated in the accompanying drawings, in which Figure lis a view in side elevation, showing parts in vertical section. Fig. 2is a plan viewof the reciprocatory clamping device. Fig. 3 is a verticalsection on the line 3 3, Fig. 2.

My invention has special reference to a reciprocatory clamping devicefor holding blanks for the construction of various dental utensils; butI do not limit myself solely thereto, as my invention embodies any useto which it may be applicable.

I carry out my invention as follows:

As shown in the drawings, a rotatable grinding wheel is shown at a. Abed or table is indicated at b to support the clamping device.

The clamping device embodies a bed-plate 0, made adjustable at itsforward end upon the bed I) in any suitable manner, as by means of anadj usting-screw (Z, said screw threaded into a metal plate 6 upon thebed I). The bed-plate c has a yielding engagement upon theadjusting-screw (Z, a spring fbeing engaged upon the screw between thebed-plate and the bed, as indicated.

Upon the bed-plate c is a guide-plate 9, upon which guide-plate is areciprocatory carrier-plate It, provided with lateral depending flangest' '6, said flanges extending downward over the adjacent sides of theguide-plate g.

Upon the reciprocatory carrier-plate h are located clamping-jaws j 7tfor clamping the shanks ofthe blankslto be ground, the shanks of theblank being engaged between the forward edges of the jawsj 7t. Screws mhold the two jawsj 7c in engagement with each other, and an additionalscrew it unites both jaws to the carrier-plate h. The jawsj 7c arespaced the one from the other at their rear ends in any suitable manner,as by an intervening washerp. The clamping-jaws may have their rearedges raised also by means of a washer q intervening between the lowerjaw is and the carrier-plate It. At the forward end of theCctlllGl'flJlktEG h is located an adjustable holding-plate or work-bed1, upon which the forward ends of the blanks may rest to be ground. Theplate r may be adjusted at its forward edge in any suitable manner, asby an adjusting-screw .9, located in the plate It and having a threadedengagement with a bearing-plate t upon the plate It, as shown in Fig. 3.By this means the forward edge of the plate 7' may be tilted upward toany desired angle to carry upward the outer extremities of the blanks.The plate r to the rear of its forward edge is also recessed, asindicated at a. By means of the adjustingscrew cl the plate 0, with theplates 9 and 7t carried thereupon, may be tilted to any desired angle,so as to cause the blanks to be ground on a taper from their outerextremities toward the shanks thereof at their rear extremities.

The operation of the device is as follows: It is obvious that byremoving the screw n the clam ping-jawsjlt may be readily removed fromthe plate 71. By loosening the screw m the blanks Z may readily beinserted with their shanks between the forward edges of saidclamping-plates, a depending ribo serving as a stop for the shanks ofthe blanks. By tightening up the screw on the clamping-jaws willeffectually bind the shanks of the blanks. Said clamping-plates are thensecured to the plate It, and any desired pitch or angle may be given tothe plate t by the adjusting-screw s. The plate It is then fed forwardupon the plate g under the rotatable grinding-wheel. After the blanksare ground upon one sidethe clampingjaws may be reversed, so that theblanks may be ground on the opposite side.

The plate r is formed with the recess 'u in order to get a uniform taperon the blanks when they are reversed- The blanks are ground to about thelongitudinal center of said recesses. When the blanks are reversed,

lows this shoulder to drop into the recess, so

that the grinding-surface of the blank would rest upon the forwardsurface of the plate.

The washer q, it will be seen, tilts the rear edges of the clamping-jawsupward, thereby forcing the blanks firmly down upon the plate 7' andholding the blanks straight upon said plate while being ground.

What I claim as my invention is 1. The combination with a support, ofmeans to adjust the pitch or angle of the support, a reciprocatorycarrierplate carried upon said support, clamping-jaws upon said platetoward one end thereof to engage the work, and a work-bed upon saidplate toward the opposite end thereof to support the work, and means toadjust the pitch or angle of the work-bed, said work-bed recessed uponits upper surface intermediate its forward and rear edges.

2. The combination with a grinding-wheel, of a reciprocatorycarrier-plate, means to adjust the angle or pitch of said plate,clamping-jaws located upon said plate toward one end thereof to engagethe work, a work-bed upon the opposite end of said holder to support thework, and means to adjust the pitch or angle of the work-bed independentof the clamping-jaws.

3. The combination with a grinding-wheel of a reciprocatorycarrier-plate to carry the work under said wheel, a support for saidplate, clamping-jaws upon said plate to engage the work at the forwardends of said jaws, and a work-bed upon the carrier-plate forward of theclamping-jaws, means to adjust the pitch or angle of the carrier-plate,and additional means to adjust the pitch or angle of the work-bed, saidwork-bed recessed upon its upper surface intermediate its forward andrear edges.

4. The combination with a grinding-wheel of a reciprocatorycarrier-plate to carry the work under said wheel, a support for saidplate, clamping-jaws upon one end of said plate, and a work-bed upon thecarrier-plate forward of the clamping-jaws, and means to adjust-thepitch or angle of the carrier-plate, said work-bed recessed upon itsupper surface intermediate its forward and rear edges.

5. The combination with a grinding-wheel of a reciprocat-orycarrier-plate to carry the work under said wheel, a support for saidplate, a stationary bed to carry said support, clamping-jaws upon oneend of said plate, and a work-bed upon the carrier-plate forward of theclamping-jaws, means to adjust the pitch or angle of the carrier-plate,and means to give a yielding movement to one extremity of saidcarrier-plate.

6. The combination with a grinding-wheel of a reciprocatorycarrier-plate to carry the work under said wheel, a support for saidplate, a stationary bed to carry saidsupport, clamping-jaws upon one endof said plate, and a work-bed upon the carrier-plate forward of theclamping-jaws, said clampingjaws elevated at their rear edges above thecarrier-plate to give a pitch or angle to the jaws, and said work-bedrecessed upon its upper surface intermediate its forward and rear edges.

In testimony whereof I sign this specification in the presence of twowitnesses.

JAMES H. DOYVNIE.

Witnesses:

N. S. WRIGHT, M. HIOKEY.

